Malicious PDF — malware analysis report

Static analysis result for SHA-256 d95de563a915ba21…

MALICIOUS

PDF

82.1 KB Created: 2021-08-30 17:51:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: fa3608aeca8422ce91ef60a3b764dc13 SHA-1: c7adf6c31f71d537f858fbf810e47a9505ed9cc4 SHA-256: d95de563a915ba21a32e0e7edf385728423024d5e6397eeff7d06e4b7b2186fa
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a link farm with numerous URLs, many of which point to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, and the document body was unreadable, so the primary attack vector appears to be the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://nstoplana.rs/ckfinder/userfiles/files/6886120586.pdf In PDF document text
    • https://pernambucoimortal.com/imagens/files/27761115149.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/f64ac1acd813d3e1b8c882553a103b5b/16614376513.pdfIn PDF document text
    • http://wallawallahighschool1968.org/clients/75819/File/86730123105.pdfIn PDF document text
    • https://www.zulilighting.com/wp-content/plugins/super-forms/uploads/php/files/5b7febbd0a398c58aadd3eddf71ec091/8505593979.pdfIn PDF document text
    • http://auburn-properties.com/userfiles/files/zusilalilobizuletexo.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f20ed2150e3---veserokadugatan.pdfIn PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/1608eec922c67d---tufasobugilojugifepexegon.pdfIn PDF document text
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1606c74b405322---logagaxulisam.pdfIn PDF document text
    • http://samurairamenbar.com/uploads/files/zovoziveroxipotewutuke.pdfIn PDF document text
    • http://dansecyr.ca/pdf/file/juzonofuwow.pdfIn PDF document text
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/50971d004a49bc0260cbe4e0d9943caf/wowazidezalejivukawo.pdfIn PDF document text
    • https://synodradomski.pl/userfiles/file/45833827677.pdfIn PDF document text
    • http://getawaynewzealand.co.nz/wp-content/plugins/formcraft/file-upload/server/content/files/160a375109e0ba---vesesetotogakowofomikabe.pdfIn PDF document text
    • http://marta-galan.com/files/varios/file/9731120560.pdfIn PDF document text
    • https://cihangirhotel.com/upload/ckfinder/files/wolifisabano.pdfIn PDF document text
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/81d86944a5d0dc66bfb0c9d6da36b3f1/36236002682.pdfIn PDF document text
    • http://jjmcp.jp/userfiles/Image/file/56724056168.pdfIn PDF document text
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb295880eb---furanebumagamoz.pdfIn PDF document text
    • https://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/visi1d2ct443094fgf6df9jsg3/nugokopilepula.pdfIn PDF document text
    • https://brod-plovdiv.com/images/jinapu.pdfIn PDF document text
    • http://farmaciafasolis.eu/userfiles/files/xikogatinogavexesiruniro.pdfIn PDF document text
    • http://gnox.vn/upload/files/nuwosiposejurizakudir.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=proportion+in+art+definitionPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dec2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEC2 17484 bytes
SHA-256: e0f25725d1aa6f60e2b4b9c7b8910ce170bf2f655b39a45e26568a36847580c8
font_01_sfnt_off00010b1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B1E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012335.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12335 10276 bytes
SHA-256: 534a6d5c0014e09da55cb3613983464577b3088b9b83b19ca3ca5d8d6b466816

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